BMSS is a school of excellence and the majority of its members are from local swimming clubs. 

The structure of BMSS has been devised to be in accordance with the ASA's Long Term Athlete Development programme (LTAD) principles.  While specific criteria are stipulated from group to group, in practice, a more flexible approach is taken by the coaching staff.  This approach allows the coaches to take into account the abilities, aspirations and level of commitment of each individual swimmer.

BMSS consists of four groups: Club Link, Rising Stars Program, Junior Olympic Program and Gold Program.